/**
    * This file Copyright (c) 2003-2012 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.module.mail;
  
  import info.magnolia.module.mail.handlers.MgnlMailHandler;
  import info.magnolia.module.mail.templates.MailAttachment;
  import info.magnolia.module.mail.templates.MgnlEmail;
  import info.magnolia.module.mail.templates.impl.SimpleEmail;
  import info.magnolia.objectfactory.Classes;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.beanutils.BeanUtils;
  import org.apache.commons.collections.CollectionUtils;
  import org.apache.commons.lang.StringUtils;
  
  
  /**
   * This reads the repository to know what kind of email to instantiate.
   *
   * @author <a href="mailto:niko@macnica.com">Nicolas Modrzyk</a>
   */
  public class MgnlMailFactory {
      private final static org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(MgnlMailFactory.class);
  
      private Map<String, String> renderers = new HashMap<String, String>();
  
  
      /**
       * Use getInstance to get the current used instance.
       */
      public MgnlMailFactory() {
  
      }
  
      public MgnlMailHandler getEmailHandler() {
          return MailModule.getInstance().getHandler();
      }
  
  
      /**
       * Creates email with no attachments.
       */
      public MgnlEmail getEmail(Map<String, Object> params) {
          return getEmail(params, null);
      }
  
      /**
       * Creates email with no attachments.
       */
      public MgnlEmail getEmailFromType(Map<String, Object> params, String type) {
  
          return getEmailFromType(params, type, null);
      }
  
      public MgnlEmail getEmailFromType(Map<String, Object> params, String type, String contentType, List<MailAttachment> attachments) {
          Map<String, Object> newParams = new HashMap<String, Object>();
          newParams.putAll(params);
          if(!StringUtils.isEmpty(type)) {
              newParams.put(MailTemplate.MAIL_TYPE, type);
          }
          if(!StringUtils.isEmpty(contentType)) {
              newParams.put(MailTemplate.MAIL_CONTENT_TYPE, contentType);
          }
          return getEmail(newParams, attachments);
      }
 
     /**
      * Creates email with attachments.
      */
     public MgnlEmail getEmailFromType(Map<String, Object> params, String type, List<MailAttachment> attachments) {
         return getEmailFromType(params, type, null, attachments);
     }
 
     /**
      * Creates email with attachments.
      */
     public MgnlEmail getEmail(Map<String, Object> params, List<MailAttachment> attachments) {
         MailTemplate template = new MailTemplate();
         return getEmail(params, attachments, template);
     }
 
     /**
      * Creates email using predefined template.
      */
     public MgnlEmail getEmailFromTemplate(String id, List<MailAttachment> attachments, Map<String, Object> params) throws Exception {
         MailTemplate template = getTemplate(id);
         if (template == null) {
             log.error("Template {} can't be found", id);
             return null;
         }
         if(!CollectionUtils.isEmpty(attachments)) {
             // add to attachments also attachments from template configuration
             attachments.addAll(template.getAttachments());
         }
         return getEmail(params, attachments, template);
     }
 
     /**
      * Creates email using predefined template with no attachments.
      */
     public MgnlEmail getEmailFromTemplate(String id, Map<String, Object> params) throws Exception {
         return getEmailFromTemplate(id, null, params);
     }
 
     protected MgnlEmail getEmail(Map<String, Object> params, List<MailAttachment> attachments, MailTemplate template) {
         template.setValues(params, attachments);
 
         try {
             return getEmailFromType(template);
 
         } catch (Exception e) {
             log.error("Couln't instantiate email type: " + template.getType(), e);
             return null;
         }
     }
 
     protected MgnlEmail getEmailFromType(MailTemplate template) throws Exception {
         MgnlEmail mail = null;
         if(StringUtils.isEmpty(template.getType()) || !renderers.containsKey(template.getType().toLowerCase())) {
             mail = new SimpleEmail(template);
 
         } else {
             String rendererClass = renderers.get(template.getType().toLowerCase());
             mail = Classes.newInstance(rendererClass, template);
         }
 
         //set all mail parameters
         if(!StringUtils.isEmpty(template.getFrom())) {
             mail.setFrom(template.getFrom());
         }
         if(!StringUtils.isEmpty(template.getTo())) {
             mail.setToList(template.getTo());
         }
         if(!StringUtils.isEmpty(template.getCc())) {
             mail.setCcList(template.getCc());
         }
         if(!StringUtils.isEmpty(template.getBcc())) {
             mail.setBccList(template.getBcc());
         }
         if(!StringUtils.isEmpty(template.getReplyTo())) {
             mail.setReplyToList(template.getReplyTo());
         }
         if(!StringUtils.isEmpty(template.getSubject())) {
             mail.setSubject(template.getSubject());
         }
 
         return mail;
     }
 
 
     protected MailTemplate getTemplate(String templateName) throws Exception {
         final List<MailTemplate> configuration = MailModule.getInstance().getTemplatesConfiguration();
         for (MailTemplate mailTemplate : configuration) {
             if (StringUtils.equals(mailTemplate.getName(), templateName)) {
                 return (MailTemplate) BeanUtils.cloneBean(mailTemplate);
             }
         }
         return null;
     }
 
 
     public Map<String, String> getRenderers() {
         return renderers;
     }
 
     public void setRenderers(Map<String, String> renderers) {
         this.renderers = renderers;
     }
 
 }